diff --git a/project_description.md b/project_description.md
index 396d03fe2a048e02fa3a42b2d882298ade9d38a8..4b29a1f9fd9ccad03bbfa2e59fc724e56e6dfb2f 100644
--- a/project_description.md
+++ b/project_description.md
@@ -35,6 +35,9 @@ Start of july - End of August (exact dates YTBD)
 * http://adsabs.harvard.edu/abs/2019arXiv190207718B
 * [Website containing some lectures on N-body integration](http://silkroad.bao.ac.cn/web/index.php/seminars/lectures)
 * https://arxiv.org/abs/1711.09100
+* http://epubs.surrey.ac.uk/812065/1/MNRAS-2016-Peuten-2333-42.pdf 
+* https://arxiv.org/pdf/1712.03979.pdf
+* https://arxiv.org/pdf/1708.09530.pdf
 
 ## Some watching material:
 * https://www.cita.utoronto.ca/presentation-archive/?talk_id=745